It's a well-known fact, that Interns are the bane of office life. They're like the weeds in the garden, constantly sprouting up, and then promptly dying under the weight of their own incompetence.
Here are a few reasons why:
Why Interns are like Virus Attachments
The Interns are So Busy, They Can't Even Tell Time
The Interns are So Inept, They Can't Even Tell the Difference Between 2:1 and 2:2
And many more... or less... depending on how you look at it.